Well, i think your problem is already in your post. There are 2 things you are doing that are gonna cause any motor to run hot. One, you have a hot plug. Two, you are using 10% nitro. Bad combination. You say it overheats, but didnt mention temps. How hot is this engine getting? Is your cooling head dis-colored? Try a cold plug, and some 20% fuel. There are soo many things you can do to bring temps down. And soo many causes of overheating. How long was this truck WOT before you shut it down?

Matt